You do no such thing. Only God can forgive sins. Any Christian can proclaim that sins have been forgiven by God if the sinner admits his sins but no man can forgive sins. Those sins were already forgiven by God.
Mark 2:7 Why doth this man thus speak blasphemies? who can forgive sins but God only?
Have you ever read the gospel of St. John?
Catechism of the Catholic Church
1449 The formula of absolution used in the Latin Church expresses the essential elements of this sacrament: the Father of mercies is the source of all forgiveness. He effects the reconciliation of sinners through the Passover of his Son and the gift of his Spirit, through the prayer and ministry of the Church:
God, the Father of mercies, |
http://biblehub.com/john/20-23.htm
Of course, you realize you are quoting the ENEMIES of Jesus to support your position?